/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtIncompatible;
import javax.annotation.Nullable;

/**
 * A skeletal implementation of {@code RangeSet}.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible
abstract class AbstractRangeSet<C extends Comparable> implements RangeSet<C> {
    AbstractRangeSet() {}

    @Override
    public boolean contains(C value) {
        return rangeContaining(value) != null;
    }

    @Override
    public abstract Range<C> rangeContaining(C value);

    @Override
    public boolean isEmpty() {
        return asRanges().isEmpty();
    }

    @Override
    public void add(Range<C> range) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void remove(Range<C> range) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
        remove(Range.<C>all());
    }

    @Override
    public boolean enclosesAll(RangeSet<C> other) {
        return enclosesAll(other.asRanges());
    }

    @Override
    public void addAll(RangeSet<C> other) {
        addAll(other.asRanges());
    }

    @Override
    public void removeAll(RangeSet<C> other) {
        removeAll(other.asRanges());
    }

    @Override
    public boolean intersects(Range<C> otherRange) {
        return !subRangeSet(otherRange).isEmpty();
    }

    @Override
    public abstract boolean encloses(Range<C> otherRange);

    @Override
    public boolean equals(@Nullable Object obj) {
        if (obj == this) {
            return true;
        } else if (obj instanceof RangeSet) {
            RangeSet<?> other = (RangeSet<?>) obj;
            return this.asRanges().equals(other.asRanges());
        }
        return false;
    }

    @Override
    public final int hashCode() {
        return asRanges().hashCode();
    }

    @Override
    public final String toString() {
        return asRanges().toString();
    }
}
